Tamper foot



April 27 1926.

G. F. KEn.

TAMPER FOOT Filed Sept. a, m25

Patented pr. 27, i926,

Unirse srri'jrns reinar ,Fries GEORG-E F. KEIL, OF EUGENE, OREGON.

TAIMPER FOOT.

Application filed. rSeptember 8, 1925,. Serial No. 54,9700.

To @ZZ zio/lona 'it may concern.

Be it hereby known that. L Guonsn F. Kinn, a citizen of the United States, and a resident of Eugene, in the county of Lane and State of Oregon have invented a new and useful Tamper Foot, of which the following is a specification.

T his invention relates generally to the art of making concrete drain tile, server pipe and Y culvert pipe, and particularly to a special form of tamper foot.

Villhe rst object of this invention is to provide a special form of tamging foot which will permit heavier and faster feeding` of the aggregate.

The second object is to permit hareer tamping Without danger of brcidring` the tamping sticks; Y A

The thirdobjectis to so construct the tamper foot that it ivill not catch on the reinforcing` Wires and thereby break same andV fause a loss of material and delay in operation. f

The fourth object is to render the tamping` more uniform throughout the length of the pipe being;r formed.

The fifth object is to prevent the tamper foot from throwing the miX up ahead of the tamper as it moves instead of drawing` it under, as is the case With this device.

rlfhe sixth and ultimate object is to increase the net production from a machine using;` this type of device, which increase, when measrued over long` periods, amounts a5 to approximately twenty per cent.

l accomplish these results in the manner set forth in the following` spccication as illustrated in the accompanyingbY drawing, in Which:

Figure 1 is a side elevation of the rtype of machine u'ith which this device is used havingits upper portion broken away in section to shou7 the tamper foot in use when reinforcing Wires are being;l used. Figure i5 i3 is a side elevation of the tamper foot with its stick broken olif and showingthe i'nanuer in which the mir; is drawn under the foot instead of piling up in front of same. Figure l is an elevation of the tam- ,50 per foot of which Figure 4 is a horizontal section taken along` the line l-t in Figure 2.

Similar numbers of reference refer to the same parts throughout the several views.

Referring in detail to the drawingrln order to better illustrate the use of this device and the advantages arising therefrom, there is indicated the usual turntal le 10 upon which is placed a cylindrical mold 11. A stationary core 12 is placed inside of the 60 mold 11 and a chute 13 .is employed to feed aggregate 1i into the space between the 'mold 11 and the core 1Q'. jVertical reinforcingwires 15 and horizontal reinforcing Wires" 1G are employed when the pipe being 65 formed is used for special purposes such as culvertsvnl etc. r i In this type of machine are employed one or ymore tamper sticks l?, on they lower end of each of Vwhich is secured tai'nper foot.` 70 lt is to this element that this particular invention refers. This tamper foot is ordinarily a U-shaped shoe rfastened by any convenient means to the bottom of the stick 17.

ln this construction l )refer to provide the foot Wit-l1 ak pair of upturned arms 18 and 19 which are secured to the stick 17 by means of the screivs 20. The arm 19 is preferably flush With its side of the stiel. The under side of the foot is provided iv h a sloping face. 21 having a rounded heel 22 and a Somewhat Square toe 23 which projects past the rearivard side of the shoe.

It is preferable to curve the entire shoe, as shown in Figure 45 so that it will better 85 accommodate itself to the shape of the pipe being tampcd. It is also desirable to have a number of different Widths of tamper feet to take care of the different thicknesses of pipe Wall and to permit their use with reinforcing Wires.

Machines of the character above described are provided with a suitable reciprocatingr mechanism7 such as ,an eceentric7 by means of kwhich the stick 17 can be moved vertically 95 at speed of approximately four hundred strokes per minute. i They are also provided with suitable friction holder for the sticks to insure the desired degree of tamping.

llhese mechanisnis are not illustrated as their use is common in the art and are ivell understood by users of this class of machines. 1

rlhe operation of the device is follows: Concretev is fed yinto the mold through the chute 13 and the mold is rotated. lf the pipes are to be reinforced the Wires 15 and 16 are' first put into pl ce and the tamping stick 17 is inserted on each side of the Wires.

As the mold is rotated the loose aggregate 119 24 passes under the heel 22 of the tamper 'toot and is gradually but rapidly tamped to the depth ot the toe 23.

Owing to the shape ot the tamper foot it is impossible Jfor the foot to pick up or pile np the. loose aggregate in case itis ted too rapidly, or the mold is rotated too rapidly within the limits, ot' course, at which inaterial is fed into such machines. lVhen the ordinary foot is employed a surplus of mix in front ot the stick will be almost certain to cause the stick to break7 and will necessitate a shut-down of the machine t'or the purpose of installing a new stiel( and removing the partially termed pipe. This is also true when trie tamper t'oot catches on the rein` forcing wires, not only causing a waste of material but also a considerable loss of operating time.

In order to secure a more perfectly uniform tamping of the concrete it is preferable to serrate the sole ot the toot. as indicated in Figure 2. This eliminates entirely any impertectly tamped arey "he unmber and shape ot' the serration can, o'i course, be varied at will.

am aware that tamper riet have long been employed in concrete pipe construction; therct'ore do not intend te cover same broadly, but l do intend to cover all such forms and inodiiications of Asaine as 'fall fairly within the appended claims.

I claim:

l. A tamper toot for concrete pipe machines having means for attaching same to a tamper stick; an undercut front heel member; and a downwardly sloping rearwardly projecting toe member.

2. A tamper foot- 'for concrete pipe ma chines having, in combinationr al pair of jecting toe extending beyond the rear of said toot.

4. A. tamper toot tor concrete pipe machines having an upright stiel: attachment .member and having a horizontally curved and downwardly sleping li'oot haring its lowermost point extending beyond its stick attachment member and haring its uppermost portion curved upwardly to one side ot the stick attachment member.

5. ir tamper toot Afor concrete pipe machines having an upturned stick attachment member consisting of two spaced arms adapted to receive a tamper stick oetwcen same and having screw holes termed through said arms, said toot having a laterally curved serrated Selc member, including a rounded heel, under one end ot said arms; and a toe at the lower end of said sole projecting beyond the opposite arm member.

GEORGE l?. KEL. 

